Parts of an Atom
Name the three parts of the atom.
Proton, Electron, and Neutron.
The ______ _____ of an element is the average mass of an element's naturally occurring atom.
atomic mass
Lithium: Sign and number of protons in one atom.
Li
3
X
Element Symbol
Ex. H
Which part of the atom is positively charged?
Proton
The atomic number tells you the amount of _________ in an element.
protons
Oxygen: Sign and number of protons in one atom.
O
8
A
Mass number (the number of protons + the number of neutrons).
Which part of the atom is negatively charged?
Electron
The number of electrons determines __________ _______ of an element.
electrical charge
Iron: Sign and number of protons in one atom.
Fe
26
Z
Atomic number (the number of protons).
What is the charge of a neutron?
A neutron has no net charge.
The atomic mass is the total number of protons and neutrons in the _________ of an atom.
nucleus
Copper: Sign and number of protons in one atom.
Cu
29
N
The number of neutrons
What parts make up the nucleus of an atom?
Protons and neutrons
In order to calculate the number of neutrons you must subtract the ______ _________ from the _____ ______.
atomic number from the atomic mass
Bromine: Sign and number of protons in one atom.
Br
35
_____ ________ minus the _____ _______ gives you the number of neutrons.
Mass number minus the atomic number